When I get tired or have a devilish grin on my face, my eyetooth kind of bites my lip on the left side. It used to do it on the right side too but that was before I lost that tooth *it was a baby tooth*. Since Sarge is a part of me, I decided to give him a little bit of my characteristics in that certain emotions he has makes him flash his gold tooth giving emphasis to his rather cynical and sarcastic attitude, but not outwardly expressed through words, just a "knowing" facial expression. Its more of an attitude thing.
Another interesting note, I modeled him after the illustration on the cover of my father's book.
You can buy one for like..2 bucks here if youre a megadork like me:
Just thinking out loud once again.
Oh and as for how he lost said tooth, well I don't think we'll ever know the /real/ reason ;)